Diffusion donstant
[化] 扩散常数
🧩 词语组成解析
🗣️ 情景例句
is my idea of heaven!
正是我所谓的天堂
I bought 7 boxes of matches.
我买了七盒火柴。
One day, the man downstairs went to talk to the man. He went upstairs and knocked the door.
一天，楼下人去找楼上人谈谈。 他上楼敲门。